LG 24MT41DF User manual

Internal Use Only
P/NO :
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
MFL69169548 (1605-REV00)
24MT41DF 24MT41DF-PZ
24MT41DW 24MT41DW-WZ
LD60A
LED TV

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Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ......................................................................... 3
SERVICING PRECAUTIONS.................................................................... 4
SPECIFICATION ....................................................................................... 6
ADJUSTMENT INSTRUCTION ................................................................ 9
TROUBLE SHOOTING ........................................................................... 15
BLOCK DIAGRAM.................................................................................. 20
EXPLODED VIEW .................................................................................. 21

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Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩand 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
1.5 Kohm/10W
0.15µF
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
When 25A is impressed between Earth and 2nd Ground
for 1 second, Resistance must be less than 0.1
*Base on Adjustment standard
IMPORTANT SAFETY NOTICE
SAFETY PRECAUTIONS

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Only for training and service purposes
CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety precautions on
page 3 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2. Test high voltage only by measuring it with an appropriate high
voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specified otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10% (by volume) Acetone and 90% (by
volume) isopropyl alcohol (90%-99% strength)
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication of
contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks are
correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily
by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistors and
semiconductor "chip" components. The following techniques
should be used to help reduce the incidence of component
damage caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the
unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
devices.
4. Use only an anti-static type solder removal device. Some solder
removal devices not classified as "anti-static" can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum foil
or comparable conductive material).
7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
CAUTION: Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion such as
the brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity
sufficient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate
tip size and shape that will maintain tip temperature within the
range or 500 ˚F to 600 ˚F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500 ˚F to 600 ˚F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500 ˚F to 600 ˚F)
b. First, hold the soldering iron tip and solder the strand against
the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.
SERVICING PRECAUTIONS

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IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

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SPECIFICATION
NOTE : Specications and others are subject to change without notice for improvement.
1. Application Range
This spec sheet is applied all of the TV used LD60A chassis.
2. Specication
Each part is tested as below without special appointment
1) Temperature : 25 ˚C ± 5 ˚C (77 ˚F ± 9 ˚F),
CST : 40 ˚C ± 5 ˚C
2) Relative Humidity : 65 % ± 10 %
3) Power Voltage : Standard input voltage
(100 V - 240 V ~, 50 / 60 Hz)
· Standard Voltage of each products is marked by models
4) Specication and performance of each parts are followed
each drawing and specication by part number in accord-
ance with BOM.
5) The receiver must be operated for about 5 minutes prior to
the adjustment.
3.Test method
1) Performance : LGE TV test method followed
2) Demanded other specication
- Safety : CE,IEC specication
- EMC : CE,IEC specication
No Item Specication Remarks
1 Market EU/CIS
(PAL Market-37 Countries)
* DTV & Analog (Total 37 countries)
* DTV (MPEG2/4, DVB-T) :37 countries
UK/Italy/Germany/France/Spain/Sweden/Finland/Nether-
lands/ Belgium/
Luxemburg/ Greece/Denmark/Czech/Austria /Hungary/
Swiss/Croatia/Turkey/
Norway/Slovenia/Poland/Ukraine/Portugal/Ireland/Morocco/
Latvia/Estonia/Lithania/
Rumania/Bulgaria/Russia/Slovakia/Bosnia/Serbia/Albania/
Kazakhstan/Belarus
* DTV (MPEG2/4, DVB-T2): 8 countries
UK/Denmark/Sweden/Finland/Norway/Ireland/Ukraine/Ka-
zakhstan
* DTV (MPEG2/4, DVB-C): 37 countries
UK/Italy/Germany/France/Spain/Sweden/Finland/Nether-
lands/ Belgium/
Luxemburg/ Greece/Denmark/Czech/Austria /Hungary/
Swiss/Croatia/Turkey/
Norway/Slovenia/Poland/Ukraine/Portugal/Ireland/Morocco/
Latvia/Estonia/Lithania/
Rumania/Bulgaria/Russia/Slovakia/Bosnia/Serbia/Albania/
Kazakhstan/Belarus
* DTV (MPEG2/4,DVB-S): 29 countries
Italy/Germany/France/Spain/Netherlands/ Belgium/ Luxem-
burg/ Greece/ Czech/
Austria /Hungary/Swiss/Croatia/Turkey/Slovenia/Poland/Por-
tugal/ Morocco/Latvia/
Estonia/Lithuania/Rumania/Bulgaria/Russia/Slovakia/Bosnia/
Serbia/Albania/ Belarus
* Supported satellite : 22 satellites
HISPASAT 1C/1D, ATLANTIC BIRD 2, NILESAT 101/102,
ATLANTIC BIRD 3, AMOS 2/3, THOR 5/6, IRIUS 4,
EUTELSAT-W3A, EUROBIRD 9A, EUTELSAT-W2A, HOT-
BIRD 6/8/9, EUTELSAT-SESAT, ASTRA 1L/H/M/KR, ASTRA
3A/3B, BADR 4/6, ASTRA 2D, EUROBIRD 3, EUTELSAT-
W7, HELLASSAT 2, EXPRESS AM1, TURKSAT 2A/3A,
INTERSAT10
4. Model general specication

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No Item Specication Remarks
2 Broadcasting system Analogue TV
1) PAL/SECAM B/G,D/K,I
SECAM L
Digital TV
1) DVB-T/T2
2) DVB-C
Satellite Digital TV
1) DVB-S/S2
3 Receiving system Analog : Upper Heterodyne
Digital : COFDM, QAM
► DVB-T
- Guard Interval (Bitrate_Mbit/s) : 1/4, 1/8, 1/16, 1/32
- Modulation : Code Rate
QPSK : 1/2, 2/3, 3/4, 5/6, 7/8
16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
► DVB-T2
- Guard Interval (Bitrate_Mbit/s) : 1/4, 1/8, 1/16, 1/32, 1/128,
19/128, 19/256
- Modulation : Code Rate
QPSK : 1/2, 2/5, 2/3, 3/4, 5/6
16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
► DVB-C
- Symbolrate : 4.0Msymbols/s to 7.2Msymbols/s
- Modulation : 16QAM, 64-QAM, 128-QAM and 256-QAM
► DVB-S
- symbol rate
DVB-S2 (8PSK / QPSK) : 2 ~ 45Msymbol/s
DVB-S (QPSK) : 2 ~ 45Msymbol/s
- viterbi
DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8
DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10
4 Interface RF / Composite /
Component(CVBS) / HDMI / D-Sub /
Scart / USB / Audio In / Headphone
Out
*SCART(EU only support)
*Composite/Component/D-sub/Audio In/Headphone
Out(MT58 only support)
5 DVB DVB-T CI : UK, Finland, Denmark, Norway, Sweden, Russia, Spain,
Ireland, Luxemburg, Belgium, Netherlands
CI+ : France(Canal+), Italy(DGTVi)
DVB-C CI : Switzerland, Austria, Slovenia, Hungary, Bulgaria
CI+ : Switzerland(UPC,Cablecom), Netherlands(Ziggo),
Germany(KDG,CWB), Finland(labwise)
DVB-S CI + : Germany (Astra HD+)

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5. External Input Support Format
- HDMI (PC)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
1 720*400 31.468 70.080 28.321
2 640*480 31.469 59.940 25.175
3 640*480 37.500 75.000 31.500
4 800*600 37.879 60.317 40.000
5 800*600 46.875 75.000 49.500
6 1024*768 48.363 60.004 65.000
7 1024*768 60.023 75.029 78.750
8 1280*800 49.702 59.810 83.500
9 1366*768 47.717 59.79 85.5 Recommended resolution
- HDMI (DTV)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
1 720* 480 31.469 / 31.5 59.94 / 60 27.00/ 27.03 SDTV 480P
2 720*576 31.25 50.00 27.864 SDTV 576P
3 1280*720 37.50 50.00 74.250 HDTV 720P
4 1280* 720 44.96 / 45 59.94 / 60 74.17/ 74.25 HDTV 720P
5 1920* 1080 33.72 / 33.75 59.94 / 60 74.17/ 74.25 HDTV 1080I
6 1920* 1080 28.125 50.00 74.25 HDTV 1080I
7 1920* 1080 27.00 24 74.25 HDTV 1080P
8 1920* 1080 33.75 30.00 74.25 HDTV 1080P
9 1920* 1080 56.250 50 148.5 HDTV 1080P
10 1920* 1080 67.43 / 67.5 59.94 / 60 148.35/ 148.50 HDTV 1080P

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ADJUSTMENT INSTRUCTION
1. Application Range
This document is applied all of monitor TV models with LD60A
chassis.
2. Designation
1) The adjustment is according to the order which is designat-
ed and which must be followed, according to the plan which
can be changed only on agreeing.
2) Power adjustment : Free Voltage.
3) Magnetic Field Condition: Nil.
4) Input signal Unit: Product Specication Standard.
5) Reserve after operation: Above 5 Minutes (Heat Run)
Temperature : at 25 °C ± 5 °C
Relative humidity : 65 % ± 10 %
Input voltage : AC 100 - 240 V, 50/60 Hz
6) Adjustment equipments : Color Analyzer (CA-210 or CA-
110), DDC Adjustment Jig equipment, SVC remote control.
7) Push The "IN STOP KEY" – For memory initialization
3. Main PCB check process
* APC - After Manual-Insert, executing APC
* Boot le Download
1) Execute ISP program “Mstar ISP Utility” and then click
“Cong” tab.
2) Set as below, and then click “Auto Detect” and check “OK”
message. If display “Error”, Check connect computer, jig,
and set.
3) Click “Connect” tab. If display “Can’t ”, Check connect
computer, jig, and set.
4) Click “Read” tab, and then load download le(XXXX.bin) by
clicking “Read”
5) Click “Auto” tab and set as below
6) Click “Run”.
7) After downloading, check “OK” message.
* USB DOWNLOAD(*.epk le download)
1) Put the USB Stick to the USB socket.
2) Automatically detecting update le in USB Stick.
- If your downloaded program version in USB Stick is
Low, it didn’t work. But your downloaded version is
High, USB data is automatically detecting.
3) Show the message “UPDATING”
4) Updating is starting.
5) Updating Completed, The TV will restart automatically in 5
seconds.
6) If your TV is turned on, check your updated version and
Tool option. (Explain the `, next stage)
* If downloading version is more high than your TV have, TV
can lost all channel data. In this case, you have to channel
recover. If all channel data is cleared, you didn’t have a DTV/
ATV test on production line.
Case1 : Software version up
1) After downloading S/W by USB , Multi-vision set will
reboot automatically
2) Push "In-stop" key
3) Push "Power on" key
4) Function inspection
5) After function inspection, Push "In-stop" key.
Case2 : Function check at the assembly line
1) When TV set is entering on the assembly line, Push "In-
stop" ke y at rst.
2) Push "Power on" key for turning it on.
→ If you push "Power on" key, TV set will recover channel
information by itself.
3) After function inspection, Push "In-stop" key.
(1) (3)
(
2
)
OK
Please Check the Speed :
Use the speed under
200KHz.
(4)
filexxx.bin
(
6
)
(5)
(7) ……….OK
(
5
)

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3.1. ADC Process (Optional) : If ADC pro-
cesses as OTP, There is no need to
proceed internal ADC.
1) Enter Service Mode by pushing “ADJ” key.
2) Enter Internal ADC mode by pushing “►” key at “ADC
Calibration”
→ Caution: Using ‘P-ONLY’ button of the Adjustment R/C,
power on TV.
* ADC Calibration Protocol (RS232)
NO Item CMD
1
CMD
2
Data 0
Enter
Adjust MODE
Adjust
‘Mode In’
A A 0 0 When transfer the
‘Mode In’,
Carry the command.
ADC adjust ADC
Adjust
A D 1 0 Automatically adjust-
ment
(The use of a internal
pattern)
Adjust Sequence
▪ aa 00 00 [Enter Adjust Mode]
▪ xb 00 40 [Component Input ]
▪ ad 00 10 [Adjust 480i & 1080p Comp]
▪ aa 00 90 End Adjust mode
* Required equipment : Adjustment R/C.
3.2. EDID Download
1) After enter Service Mode by pushing “ADJ” key.
2) Enter EDID D/L mode.
3) Enter “START” by pushing “OK” key.
→ Caution: - Never connect RGB/HDMI cable when EDID
downloaded.
* Edid data and Model option download (RS232)
NO Item CMD 1 CMD 2 Data 0
Enter
download MODE
Download
‘Mode In’
A A 0 0
EDID data and
Model option
download
Download A E 00 10
3.2.1. EDID
- HDMI : Checksum : 95 7E
3.3. Function Check
3.3.1. Check display and sound
■ Check Input and Signal items. (cf. work instructions)
1) TV(DTV, RF, Satellite(Satellite model))
2) AV (SCART/CVBS)
3) COMPONENT (480i)
4) HDMI1/2
(22MT48, 22LH450V&MT58 - PC : 1920 x 1080 @ 60Hz,
20/ 24/28/29MT48 - PC : 1366 x 768 @ 60Hz )
5) RGB(PC : 1920 x 1080 @ 60Hz)
6) PC Audio In
7) Headphone Out
8) USB
* Display and Sound check is executed by Remote control.
* Some models do not support AV & COMPONENT & RGB &
PC Audio In & Headphone Out. It depends on model spec.
→ Caution : Not to push the INSTOP KEY after completion if
the function inspection.
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72
38
2D
40
10
60
2C
45
20
6
44
21
0
0
1E
2
3A
80
18
71
38
2D
70
40
58
2C
45
0
56
50
21
0
0
1E
0
0
0
0
7E
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
0
FF
FF
FF
FF
FF
FF
0
1E
6D
CA
59
1
1
1
1
10
1
1A
1
3
80
33
1D
78
EA
62
75
A3
55
4F
A0
27
20
12
50
54
A7
6A
0
31
4F
45
4F
61
4F
81
0
1
1
30
1
1
1
1
1
1
66
21
56
AA
51
0
1E
30
46
8F
40
33
0
FD
1E
11
0
0
1E
0
0
0
FD
0
38
4B
1E
50
3D
9
0
0A
20
20
20
20
20
20
0
0
0
FC
0
32
60
44
20
48
44
20
4C
47
20
54
56
0A
20
0
0
0
FF
70
0
0A
20
20
20
20
20
20
20
20
20
20
20
20
1
95

- 11 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. Total Assembly line process
4.1. White Balance adjustment
1) Color Analyzer: CA-210 (LED Module : CH 14)
2) Adj. Computer(During auto adj., RS-232C protocol is
needed)
3) Service Remote control
* RGB Gains are xed data for each model. Insert RS-232C
Jack which is connected with PC for White Balance or
equivalent device.
→ Total Assembly line should be check whether the color
coordinate(x,y) data refer to below table were meet or
not. Color coordinate is differ from panel’s characteristics
of color temperature. Please check panel characteristics
about color temperature.
- Cool Panel
▪ White Balance Default value
* Connecting picture of the measuring instrument (On Auto-
matic control)
- Inside PATTERN is used when W/B is controlled. Con-
nect to auto controller or push Adjustment R/C POWER-
ON → Enter the mode of White-Balance, the pattern will
come out.
* Auto-control interface and directions
1) Adjust in the place where the inux of light like oodlight
around is blocked. (Illumination is less than 100Lux).
2) Adhere closely the Color Analyzer ( CA210 ) to the
module less than 10cm distance, keep it with the surface
of the Module and Color Analyzer’s Prove vertically.
(80~100°).
3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 5 minutes.
- Using ‘no signal’ or ‘full white pattern’ or the others,
check the back light on.
* Auto adjustment Map(using RS-232C to USB cable)
RS-232C COMMAND
[ CMD ID DATA ]
Wb 00 00 White Balance Start
Wb 00 ff White Balance End
RS-232C
COMMAND
[CMD ID DATA]
M
I
N
CENTER
(DEFAULT)
M
A
X
Cool Mid Warm Cool Mid Warm
R Gain jg Ja jd 00 172 192 192 254
G Gain jh Jb je 00 172 192 192 192
B Gain ji Jc jf 00 192 192 172 254
R Cut 64 64 64 128
G Cut 64 64 64 128
B Cut 64 64 64 128
**Caution
- Color Temperature : COOL, Medium, Warm.
- One of R Gain/G Gain/ B Gain should be kept on 0xC0, and
adjust other two lower than C0.
(when R/G/B Gain ar e all C0, it is the FULL Dynamic Range
of Module)
Color
Temperature
Cool 13,000 °K X=0.276 (±0.04)
Y=0.275 (±0.04)
<Test Signal>
Inner pattern
(204gray,80IRE)
Medium 9,300 °K X=0.290 (±0.04)
Y=0.298 (±0.04)
Warm 6,500 °K X=0.318 (±0.04)
Y=0.334 (±0.04)
Luminance
(cd/m²)
Cool Min : 80 Typ : 110 <Test Signal>
Inner pattern
(204gray,80IRE)
Medium Min : 70 Typ : 110
Warm Min : 80 Typ : 110
Model Gain Cut
R G B R G B
MT4122 MT41 LGD
(AH-IPS/
FHD)
Cool 125 130 192 64 64 64
Medium 161 170 210 64 64 64
Warm 185 185 192 64 64 64
Heesung
(AH-IPS /
FHD)
Cool 121 126 192 64 64 64
Medium 165 172 210 64 64 64
Warm 186 185 192 64 64 64
24MT41 CMI
(VA / HD)
Cool 178 172 213 64 64 64
Medium 171 185 196 64 64 64
Warm 192 185 144 64 64 64
LGD
(AH-IPS/
HD)
Cool 180 172 216 64 64 64
Medium 192 172 185 64 64 64
Warm 192 154 120 64 64 64
BOE
(VA / HD)
Cool 192 182 208 64 64 64
Medium 192 175 170 64 64 64
Warm 192 168 104 64 64 64
28MT41 Heesung
BM
CSOT
(VA / HD)
Cool 179 172 208 64 64 64
Medium 192 180 177 64 64 64
Warm 192 167 110 64 64 64
Heesung
BM
BOE
(VA / HD)
Cool 182 172 222 70 70 70
Medium 192 173 192 70 70 70
Warm 192 168 130 70 70 70
Chilin BM
BOE
(VA / HD)
Cool 192 170 204 70 70 70
Medium 192 157 163 70 70 70
Warm 192 146 102 70 70 70
Heesung
BM VI
BOE
(VA / HD)
Cool 192 170 204 70 70 70
Medium 192 157 163 70 70 70
Warm 192 146 102 70 70 70

- 12 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
* Manual W/B process using adjusts Remote con-
trol.
■ After enter Service Mode by pushing “ADJ” key,
■ Enter White Balance by pushing “►” key at “White Bal-
ance”.
* CASE Medium Mode
First adjust the coordinate far away from the target value(x
,y).B
1) x ,y > target
2) x ,y< target
3) x > target ,y< target
4) x< target ,y > target
- Every 4 case have to t y value by adjusting B Gain and
then t x value by adjusting R-Gain
- In this case ,increasing/decreasing of B Gain and R Gain
can be adjusted.
How to adjust
1) if G gain more than 172
Adjust R Gain and B Gain less than 192
2) if the G gain value be adjusted down to 172
One of the R/B Gain is 254
3) if G Gain is 172 ,More than one of R/B Gain is to be be-
tween 192~254
* CASE Cool / Warm
First adjust the coordinate far away from the target value(x ,y).
1) x ,y > target
i) Decrease the R ,G.
2) x ,y< target
i) First decrease the B gain ,
ii) Decrease the one of the others.
3) x > target ,y< target
i) First decrease B ,so make y a little more than the
target.
ii) Adjust x value by decreasing the R
4) x < target ,y > target
i) First decrease B ,so make x a little more than the
target.
ii) Adjust x value by decreasing the G
* After You nish all adjustments, Press “In-start” button and
compare Tool option and Area option value with its BOM, if it
is correctly same then unplug the AC cable. If it is not same,
then correct it same with BOM and unplug AC cable. For cor-
rect it to the model’s module from factory JIG model.
* Push The “IN STOP KEY” after completing the function
inspection. And Mechanical Power Switch must be set “ON”.
4.2. DPM test
■ Measurement Condition: 100 - 240V ~ 50/60Hz
1) Set Input to RGB-PC and connect D-sub cable to set –
RGB Mode. Set Input to HDMI (with Input Label set to PC)
and connect HDMI cable to set – HDMI Mode
2) Cut off H sync or V sync of signal.
3) Check DPM operation refer to the below table.
4.3. PIP test
1) Press “Power on” key of service remote control.
2) Input RGB & TV(ATV or DTV) signal.
3) Set Input mode to RGB.
4) Press ‘PIP” key of service remote control
5) Check TV Video & Audio signal of Sub picture.
4.4. Outgoing condition Conguration
■ When pressing IN-STOP key by SVC remocon, Red LED
are blinked alternatively. And then automatically turn off.
(Must not AC power OFF during blinking)
5. Model Name & Serial Number
Download
5.1. Model name & Serial number
■ Press “Power on” key of service remocon.(Baud rate :
115200 bps)
■ Connect USB to RS232 Signal Cable to USB Jack.
■ Write Serial number.
■ Must check the serial number at the Diagnostics of SET UP
menu. (Refer to below).
Operating Condition Sync
(H/V)
Video LED
(SET)
Wattage
(W)
Power S/W On Sleep mode -
RGB,HDMI
Off/Off Off Amber 1

- 13 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
5.2. Signal TABLE
CMD: A0h
LENGTH : 85~94h (1~16 bytes)
ADH : EEPROM Sub Address high (00~1F)
ADL : EEPROM Sub Address low (00~FF)
Data : Write data
CS : CMD + LENGTH + ADH + ADL + Data_1 + … + Data_n
Delay : 20ms
5.3. Command Set
* Description
FOS Default write : <7mode data> write
Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0,
Phase
Data write : Model Name and Serial Number write in EE-
PROM,.
5.4. Method & notice
1) Serial number D/L is using of scan equipment.
2) Setting of scan equipment operated by Manufacturing
Technology Group.
3 )Serial number D/L must be conformed when it is produced
in production line, because serial number D/L is mandatory
by D-book 4.0
* Manual Download (Model Name and Serial Num-
ber)
If the TV set is downloaded By OTA or Service man, Some-
times model name or serial number is initialized.( Not always)
There is impossible to download by bar code scan, so It need
Manual download.
1) Press the 'Instart' key of ADJ remote control.
2) Go to the menu 'Model Number D/L' like below photo.
3) Input the Factory model name (ex 27MT58DF-PZ) or Serial
number like photo.
4) Check the model name Instart menu →Factory name
displayed (ex 27MT58DF-PZ)
5) Check the Diagnostics (DTV country only) →Buyer model
displayed (ex 27MT58DF-P)
6. MAC Address & CI+ Key Down-
load
6.1. MAC Address
6.1.1. Equipment & Condition
▪ Play le : Serial.exe
▪ MAC Address edit
▪ Input Start / End MAC address
6.1.2. Download method
6.1.2.1. Communication Prot Connection
Connection : PCBA (USB Port) → USB to Serial Adapter (UC-
232A) → RS-232C cable → PC(RS-232C port)
6.1.2.2. MAC Address & CI+ Key Download
▪ Set CI+ Key path Directory at Start Mac & CI+ Download
Programme
▪ Com 1,2,3,4 and 115200 (Baudrate)
▪ Port connection button click(1)
▪ Push the (2) MAC Address write.
▪ At success Download, check the OK (3)
▪ Start CI+ Key Download, Push the (4)
▪ Check the OK or NG
CMD LENGTH ADH ADL DATA_1 ... Data_n CS DELAY
No. 1
Adjust mode EEPROM WRITE
CMD(hex) A0h
LENGTH(hex) 84h+n
Description n-bytes Write (n = 1~16)

- 14 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
* Check the Download to CI+ Key value in LG set.
1) Check the method of CI+ Key value
a) Check the method on Instart menu
2 ) Check the method of CI+ key value(RS232)
a) Into the main ass’y mode(RS232: aa 00 00)
b) Check the mothed of CI+ key by command
(RS232: ci 00 20)
c) Result value
OKx : CI+ Key Download OK
NGx : CI+ Key Download NG
CMD 1 CMD 2 Data 0
A A 0 0
CMD 1 CMD 2 Data 0
C I 1 0

- 15 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
TROUBLE SHOOTING
1. No Power
Replace X200
N
Check C400
Voltage Level (19V)
Check Power connector
OK ? Replace Adapter
Y
N Y
Check IC1001
Output(#16)
Voltage Level (3.3V)
Replace IC1001 &
Recheck
Y
N
Check X200 Clock
24MHz
Replace IC100 Flash
Memory
Y
Check IC403 Output
Voltage Level (5V)
Replace IC403 &
Recheck
Y
N
Check IC402 Output
Voltage Level (1.15V)
Replace IC402 &
Recheck
N
Y

- 16 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
2-1. No Screen on(20/ 22/ 27 inch)
Replace Cable
N
Module Back Light On?
Check IC1001 & Q1002
Replace LED Driver IC or FET
Y
N
N
Check Panel Power 5V (P602 #1)
Check IC403 Output 5V
Replace IC403 &
Recheck
Y
N
Check Panel input Clock
P602 (#10, #11 )
Check IC101
Repair Main B/D
Y
N
Check FFC Cable for Damage or
Open Conductors
Check LED Driver Output
(C1024)
Replace T-Con Board or Module
Y
Check IC101
Replace Main SOC
N
Check WLED_ENABLE High?
Y

- 17 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
2-2. No Screen on(24/ 28/ 29 inch)
Replace Cable
N
Module Back Light On?
Check IC1001 & Q1002
Replace LED Driver IC or FET
Y
N
N
Check Panel Power 12V (P600 #30)
Check IC400 Output 12V
Replace IC400 &
Recheck
Y
N
Check Panel input Clock
P600 (#9, #10 )
Check IC101
Repair Main B/D
Y
N
Check FFC Cable for Damage or
Open Conductors
Check LED Driver Output
(C1024)
Replace T-Con Board or Module
Y
Check IC101
Replace Main SOC
N
Check WLED_ENABLE High?
Y

- 18 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. No Video - Digital TV
Check RF Cable
Y
1. Check RF IC(L3704)Power (3.3V)
2. Check IC1001 Output voltage(3.3V)
Replace IC1001 &
Recheck
Y
N
Check SCL/SDA Line(TU3702/TU3703 #1, #2) Replace TU3702/TU3703
or IC101(=> Main Scaler)
N

- 19 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. No Video - HDMI
Replace Main Scaler
(IC101)
Check input signal format
Is it supported?
Check JK800/JK801 for proper
connection or Damage Replace Connector
Y
N
Check I2C Signal
(JK800/JK801) Re Download EDID Data
Y
N
Y
Check HDMI Cable for Damage or
Open Connector
Y

- 20 - LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
BLOCK DIAGRAM
MSTAR M1A+
COMPONENT
RGB
HDMI1
DSUB R/G/B/H/V
Audio IN
HP L & R out
COMP_Y , Pb ,Pr
COMP_L & R_IN
USB (Jpeg,MP3,DVIX)
LGIT H alf NIM (DVB T/C)
SCART (Full)
PCMCIA Slot
FE_Tuner_SDA&SCL
SCART_OUT
FE_TS_CLK FE_TS_VAL_ERR FE_TS_SYNC FE_TS_DATA[0~7]
NAND Flash
TC74LCX244FT Buffer
CI_CLK CI_VIAL Error CI_SYNC CI_DATA[0~7]
CI ADDR[0~7]
PCM_DATA [0~7]
PCM_A
[0~7]
CI_ADDR[0~14] REG CI_OE CI_IOR D CI_IOW R CI-WE
PCM_A
[0~14]
FE_DE_SDA&SCL
SERIAL Flash
CVBS
TV L&R Sound
F_RB PF-OE
PF_CEO
SPI_CK SPI_CI SPI_CS SPI_DO
System EEPROM
EEPROM SCL & SDA
Panel
Digital amp (BM28720MUV)
SP (L)
SP (R)
Audio_ Master_CLK /DATA[3]
LVDS
SIF
HP L/R
H/P
Country Option (DVB only)
AMP SCL&SDA
CVBS
XTAL : 24MHz
TMDS : 148.5MHz
Country Option
Country Option (DVB only)
HDMI2
HDMI_TMDS & HDMI I2C
HDMI_TMDS & HDMI I2C
SCART R/G/B/H/V
-DVB-T/C : TDJS-G301D (Half NIM)
-DVB-T2/C/S2 : TDJA-G301D (Combo Half NIM)
*Tuner country Option
*H/P, Audio IN, DSUB, COMPONENT Option
-MT58 Use -MT48 Not use
*HDMI Option MT58 2EA Use MT48 1EA use
*
Internal DDR3: 800MHz